Drafting instrument.



J. P. COLLINS.

DRAFTING INSTRUMENT.

APPLICATION FILED SEPT. 28, 1910.

1,109,322, Patented Sept. 1.1914.

Witnesses THE "wants PETERS ca, PHOTO LITHO WASHINGTON. n u.

JOSEPH FRANCIS COLLINS, OF WASHINGTON, DISTRICT OF COLUMBIA.

DRAFTING INSTRUMENT.

Specification of Letters Eatent.

Patented Sept. 1, 1914.

Application filed September 28, 1910. Serial No. 584,267.

To all whom it may concern:

Be it known that I, JOSEPH FnanorsCon- LINS, a citizen of the UnitedStates, residing at 2049 Ninth street northwest, Washington, District ofColumbia, have invented certain new and useful Improvements in DraftingInstruments, of which the following is a specification.

This invention relates to an improvement in drafting instruments and hasfor one of its objects to provide a marking attachment, comprising aplurality of marking elements, which is primarily intended to be appliedto compasses of different types, but which may be used, by applying asuitable handle thereto, as a railroad pen, or in fact as any straightline pen.

A further object of the present invention is to provide a markingattachment, which may be used as a common bow pen to draw a singlestraight line, or by making certain adjustments therein may be convertedinto an instrument whereby a plurality of parallel lines may be drawnsimultaneously.

1 am aware that drawing instruments have been heretofore invented whichcontemplate the drawing of a plurality of lines at one time, but noinstrument has. heretofore been invented, in so far as I know, whichprovides a plurality of marking ele ments, so arranged that any one ofsaidelements may be adjusted into or out of marking position, and whereall of said elements may be brought into marking position, at

the same time.

The present invention comprises a plurality of marking elementsadjustably secured to a common member, and means engaging each of saidelements, whereby either one of them maybe adjusted, vertically, intoand out of marking position; the outer one of said marking elementsbeing provided with means for laterally adjusting it in relation to theinner marking element.

Further objects and advantages of my invention will appear from thefollowing descript-ion, with reference to the accompanying drawing,wherein- Figure l is a view in side elevation of a compass provided withmy invention. Fig. 2 is a detail view of my improved attaclnnent, partlyin section. Fig. 3 is a sectional view taken on the line 33 of Fig. 1.Fig. 4 is a view in side elevation of a modified form of my invention.

Referring more specifically to the drawings, wherein like referencenumerals indicate like parts throughout the different views, the numeral1 designates a compass of the ordinary construction, comprising thedepending legs 2 and 3, pivotally connected, as at 4. I

The leg 2 is made in two sections, which are hinged together at thepoint 5, the lower section of the said leg being provided at its extremelower end, with a pivot or needle 6. The opposite leg 3 has a socketformed in its lower end, wherein the reduced end of the shank 7 fits,being held in place by means of the set screw 8.

A. yoke member 9 is secured to this shank 7 means of the hingedconnection 7, this yoke member having a pair of alined bear- Y ingsformed adjacent to the lower ends of the depending tines 9 On the outerface of one of the tines of said yoke member,

and surrounding one of the aforementioned bearings, an annular studprojects, being indicated by the numeral 10, the outer face of said studhaving recesses 12 formed thereon.

An abbreviated shaft 13 is adapted tov pass through the alined bearingsof the yoke member, one end of this shaft having a transverse lug orknife-edged pin 14 secured thereto, which is arranged to normally engagein the recesses 12, of the stud A suitable head is provided at theopposite end of the shaft 13, and a small coil spring 15 is placedthereon, whereby one end of the spring will abut against the inner faceof the head while the other end will press against one of the dependingtines of the yoke 9; the normal tendency of said spring being to holdthe lug or pin 14: in engagement with one or more of the recesses 12, 7

whereby the shaft 13 will be prevented from rotating.

Rigidly mounted on the shaft 13 and located between the tines of theyoke member 9, is a small pinion 16, the function of which 7,

will be further described hereinafter.

The numeral 17 indicates a marking element, provided with a head portion18, the inner face thereof having rack teeth 19 formed thereon. Sideplates 19 are suitably 1 secured to said rack head, the free edgethereof being bent, thus forming flanges 20.

In assembling the different parts of my invention thus far described itwill be seen that the side plates 21, together with the a5" parallelto'the guide rod 25, and provided head portion of the marking element 17form a substantially hollow rectangular casing,"which is'adapted to beinserted between the tines of the yoke member 9. The abbreviated shaft13,

tical slots 22, formed. in the side plates 21 while the pinion 16,

will readily mesh with the rack teeth 19'0f,

to prevent any lateral play of the abovenamed'marking element, asubstantially U-shaped guide issecured to'the outer face of one'of theside plates 21, within which one of the tines of the'yoke member 9snug-g The numeral 24, indicates a short rail member, which 'is providedon its inner face with the rack teeth 25. This rail member h asslide-ways 26, formed on each side,

plates 21',"are adapted to fit, 'while 'the rackf 3 teeth 25, are solocated that they will mesh with the opposite side of the pinion 16,from' that which'meshes with the teeth 19 of the marking element 17.'-On the outer face of this rail member 2 1, and adjacent to the lower'endthereof, is the outwardlyextencb ingguide rod 25*, while-from adjacentto the top of said rail, projects an adjusting rod or bar-26, this lastnamed rodf being with screwthreads throughout its length.

' I The marking element 27 which is sub-f sta'ntially a di'iplicate' ofelement 17, has an angular head 28, the upper portion thereof beingbifurcated 26*; Two sets of bearings are formed in'this upper portion,and are "spaced apart exactly the same distance as within" thebifurcated'endportion 26 of'the head 28;'and in alineme'nt with th'e'b'ear'ings F are the guide rod and the adjusting rod on the rail member2i. e x

A suitable "adjusting nut 29' is inserted formed'therein, the said nutbeing 'adapted to-mesh with the screw threadsOnthe rod 26 when the partsare assembled.

From the above description, theope'rati'on of my device will be seenfltobe as follows:

the embodimentshownin Fig. 1, wherean my nventlon is shown attached to acompass of the ordinary construct10n,=whenever it is necessary tousethef-instriunent to draw a single circle of extremely small diameter,

the inner marking element 'must be used markin alone. In this case,supposing the 'outer element'to bein marking position,

"the 'sha t 13 is pressed inwardly a'gainst the pressure of the spring15. "As has been stated heretofore, 'this shaft carries the locking keyor :pin; 14, which i's'normally heldin passes through ,ven-u po'sitedirections simultaneously.

1 elements, elements engagement with the recesses by the v sprlng 15,so'tha-t it will be seen thatit is formed 011 the marking elements, andwillaccordingly raise the outer marking elementa and lower the inner oneto the desiredpov 1 sition. The shaft 13 being released,*when themarkingjelement is in the desired posi-f tion'the locking element or keywill immediately engage with the"'recesses 12 and thus securely lock thetwo marking elements in their" adjustecbpo'sitions. In some instances,

however, itis necessary todraw a plurality. j

ofsets of concentric circles; as in the case of illustrating an end viewof-a number of pipes. WVhenusdiin an instance of this kind, the markingelementsfa'rei adjusted in the marking points thereof are brought intoalinement, the outer marking elementbeing- I "indicate the I thicknessof the pipe, after which adjustments have been 'made the -instrumentIS'HSGCl as anordlnary compass."

Itwillbe understood that I may accom- 1 '7 whereby the shaft 13,'andalso the v wthe manner as' desc'rib'ed above "except that I wherein thefla'ngededges20, of the side vadjusted laterally by means of theadjusting j there is a' sufficient distance'be, "tween the "twoelementsgasgfor" instance, to'si 95,

plish t-the: vertical' and lateral adjustments- I of the markingelements in various ways,

the means disclosed in the; accompanying drawing 1 i simply illustratingthe I preferred embodiment ofmy lnvention". v i What I'olainnand'forwhich I desireto I '"sec'ureIietters Patent,is: a 1. In adrafting instrument, a supporting v member a plurality -of marking?elements mounted thereon, I and common means 1 for adjusting thedifferent elements in op'posite' directions simultaneously one towardand the other from said member.

2. In'a draftihg-instrmnent, aplurality I of marking elements parallelto each other,

relative to each other; and means for verti 3. In a. draftinginstrument, the combina- -'means for' laterally spacing. said elements;

tion of'aholder with a plurality of marking 2 means common to each ofsaid for, Y vertically 5 ad tlStlIlg them 1 s1- multaneously, and means"for} 'lOCklDg said adjusting means whereby said elements will beheld intheir adjusted positions.

iz-In adraftinginstrument, the combina- *tion with a' supportingimeinberand a? pair 0f marking elen1ents"'arrangecl thereon toassumemarkingpositions spaced apart, of

common means connected to eachof saidelements for adj usting the 1 sametoward. and

from said support so that one will be in its marking position and theother out of its marking position or both in their respective markingpositions.

5. In a device of the class described, the combination with a pair ofmarkin elements and a supporting member theretor, of lateral adjustingmeans connected to one of said elements, and common adjusting meansconnected to each of said elements for adjusting the same simultaneouslytoward and from said support so that one will be in its marking positionand the other out of its marking position or both in their respectivemarking positions.

6. In a device of the character described, the combination with aplurality of markin r elements, rack teeth carried by each of saidelements, of means adapted to mesh with said rack teeth, whereby saidmarking elements may be vertically adjusted in opposite directionssimultaneously.

7. A drawing instrument comprising adjacently mounted reciprocablemarking elements arranged to assume marking position spaced apart, andcommon means for reciprocatin said elements to bring either one into anthe other out of its marking position.

8. A drawing instrument comprising adjacently mounted reciprocablemarking elements, and common means for reciprocating said elements inopposite directions simultaneously to bring either one into and theother out of marking osition.

9. A compass comprising a center point, a movable member havin mountedthereon a plurality of marking e ements arranged to mark upon adjacentportions of a surface one at a greater distance from said center pointthan the other, and common means for adjusting said elements toward andfrom said member so that one will be in its marking position and theother out of its marking position or both 1n their respective markingpositions simultaneously.

In testimony whereof I aiiix my signature in presence of two witnesses.

JOSEPH FRANCIS COLLINS.

Witnesses:

Lnsm'n SMrrHsoN, FRANK S. APPLEMAN.

Copies oi this patent may be obtained for five cents each, by addressingthe Commissioner oi Iatcnts, Washington. D. 0."

